Polycrystalline diamond compact

A polycrystalline diamond compact, comprising a cemented carbide substrate having a longitudinal axis, and a polycrystalline diamond layer bonded to a top end of the cemented carbide substrate;

• wherein:
• the polycrystalline diamond layer is nonplanar and comprises a working face bounded by a circumference;
• the working face comprises a central part and a peripheral part surrounding the central part;
• the central part is protruding relative to the peripheral part;
• the central part is a planar surface or a domed surface;
• the peripheral part comprises a plurality of cutting edges and peripheral surfaces consisting of the entire peripheral part except for the cutting edges;
• each of the plurality of cutting edges is formed at the intersection of two peripheral surfaces, the intersection being a straight line and the two peripheral surfaces extending downward from the intersection in an opposite circumferential direction with respect to each other;
• each of the plurality of cutting edges extends radially outward to the circumference of the working face thereby defining a joint point having the uppermost height of the circumference;
• the joint point is configured for providing a stress point in formations during drilling;
• and
• each of the plurality of cutting edges is slanted downward and outward with respect to the longitudinal axis.